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clarify the various types of child keys derived from an identity

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Justus Ranvier 2015-12-18 10:47:44 -06:00
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@ -31,9 +31,29 @@ Payment codes add identity information to transactions which is useful in a merc
We define the following 3 levels in BIP32 path:
<pre>
<code>
m / purpose' / coin_type' / identity'
</pre>
</code>
The child keys derived from an identity are used in different ways:
<code>
m / purpose' / coin_type' / identity' / 0
</code>
The 0th (non-hardened) child is the notification key.
<code>
m / purpose' / coin_type' / identity' / 0 through 2147483647
</code>
These (non-hardened) keypairs are used for ECDH to generate deposit addresses.
<code>
m / purpose' / coin_type' / identity' / 0' through 2147483647'
</code>
These (hardened) keypairs are ephemeral payment codes.
Apostrophe in the path indicates that BIP32 hardened derivation is used.